I saw this posted on LinkedIn. As someone who makes a pretty good living off of writing, all I can say is, "No. Just don't. Not if you really want to be a good writer." I wouldn't give a nickle for most of these products, and some are actually quite destructive.
Buy yourself a standard HS grammar textbook and Strunk and White's. Bust your ass studying them--live in them. And then read good writers as much as you can. And when you aren't busting your ass studying and reading, write. That is the only way.
@John_Scotus
I've had a copy of S&W's since high school. I was in my 30s before I learned the "White" was E.B. White, and that before the 50s it was just Strunk's name on the cover.